#include<stdio.h>
my_strncat(char* dest, const char* src, unsigned int n) {
	while (*dest) dest++;
	while (*src && n--) *dest++ = *src++;
}
/*int main() {
	char arr[20] = "hello ";
	char* p = "world";
	my_strncat(arr, p, 3);
	printf("%s\n", arr);
	return 0;
}*/